In a medium bowl, toss together cheese, zucchini, carrot, onion, salsa and jalapeño. Spread a thin layer of softened butter on one side of each piece of bread. Evenly divide mixture between 2 unbuttered slices of bread - top each with the remaining bread, buttered side up.

Place both sandwiches on the grill press and close the top - cook until the cheese has melted and the bread has toasted, about 2 to 5 minutes depending on your machine. Alternatively, you can prepare this in a skillet heated with a bit of oil - just weigh the assembled sandwiches down with a plate and a couple heavy cans to mimic the "pressed sandwich" effect.